This code of practice was adopted by a meeting of experts convened by the ILO (Turin 2-10 Dec. 1974. Intended to provide guidance for governments, employers and workers, it sets out the principles that should be followed for the control of workplace noise and vibration, and contains the information required for the establishment of control programmes for individual plants. Definitions are followed by chapters devoted to: general principles (duties of employers and workers, co-operation, factory inspection); organising principles of prevention; noise measurement and assessment (hearing conservation, oral communications, fatigue, measuring instruments, instrument accuracy and calibration, recording of data); noise limit levels (hearing impairment, ultrasound and infrasound, fatigue and comfort, etc.); vibration measurement; vibration limits; whole-body vibration; identification of risk areas; noise and vibration control: new equipment; noise and vibration control in the working environment; protective equipment and reduction of exposure time; health supervision. Appendices: international standards; information on health hazards of noise, ultrasound, infrasound and vibration; maximum allowable levels of ultrasound; noise hazard contours; signs indicating noise zones, etc.